Catalog Search Results
Pub. Date
2018.
Language
English
Description
Compare models which may explain female birds' choice of mates. Observe how females "test" potential mates and how males provide a basis for choice, through courtship displays or offering prime territory. Study the intricacies of avian monogamy and polygamy; take account of pair bonding in birds, extra-pair mating, sexual role reversal, and the avian equivalents of "adultery" and "divorce."
Pub. Date
2018.
Language
English
Description
Investigate three forms of avian polygyny, where one male mates with several females, and the factors that make it a useful adaptation. Then discover "leks," courtship arenas where males compete for mates, and witness the dramatic courtship displays of some male birds. Marvel at the Australian bowerbirds, who build elaborate, decorated structures whose only purpose is to attract a mate.
Pub. Date
2018.
Language
English
Description
Learn how birds mate; then examine the structure of bird eggs, how they are laid, and how laid eggs develop. Observe how nests are constructed, the diverse materials used to build them, the types and functions of nests, and the range of ingenious avian nesting behavior. Finally, explore how birds incubate their clutch, and study brood parasites, who lay eggs in the nests of other birds.
Pub. Date
2018.
Language
English
Description
Explore the hatching process and the contrasting conditions for altricial chicks (born naked and helpless) versus precocial chicks (born ready to leave the nest). Delve into how birds feed their young, and the process of educating fledglings for life in the wild. Study the adaptations of siblicide (nestlings killing each other), unmated young who help raise broods, and avian communal breeding.
Pub. Date
2017.
Language
English
Description
Begin by delving into the history of birdwatching in the U.S., from the early naturalists of the 18th century to today's highly organized activity. Then look into the origins of birds, and how they are linked evolutionarily to dinosaurs and early reptiles. Finally, explore bird taxonomy, and how their scientific classification aids us in identifying them in the field.
Pub. Date
2017.
Language
English
Description
Investigate the anatomy of birds, and how understanding anatomical features aids us in identification. Then learn about the fascinating range of bird feathers, and their different functions. Observe how understanding the flight patterns of birds helps identify them in the field. Last, compare two common birds, as an exercise in using the knowledge you've learned so far.
Pub. Date
2017.
Language
English
Description
Look first at three physical tools that you can use right away to become a more effective birder. Consider how familiarity with the shape or silhouette of bird families, as well as bird size, aid you in focusing in on exact species. Study the color factors of pigment and keratin, as they produce the dazzling range of bird coloration, and investigate color as an identification tool.
Pub. Date
2017.
Language
English
Description
Take account of three further aids for bird identification. See how charting birds' distribution or geographical range provides much useful information about specific species. Grasp the benefits of knowing a bird's status, or abundance vs. rarity, and how status can change. Also study the factor of endemism, where birds are limited to one specific region, and the uses of this information.
Pub. Date
2017.
Language
English
Description
Explore the North American habitats of forest, grasslands, desert, sagebrush, chaparral, and tundra, distinguishing their specific features and the amazing birds that are native to each of these environments. Add to this knowledge by investigating the roles of habitat specialization, the seasons, and migration patterns as they help us in identifying bird species.
90) The National Geographic Guide to Birding in North America: Episode 6,Introduction to Birding Optics
Pub. Date
2017.
Language
English
Description
This lecture discusses the core optical tools that aid us in observing birds in the field. Study the parts of a pair of binoculars, and the pros and cons of different types of binoculars. Learn how to use binoculars for birding, highlighting matters such as magnification, field of view, and depth of field. Also take account of spotting scopes, and how they provide detail that binoculars can't.
Pub. Date
2017.
Language
English
Description
Today, review a range of methods for attracting birds, in the field and at home. In both places, consider the use of stealth and concealment techniques, for observing while remaining unobserved. Study the remarkable ability of sounds to attract birds, and the use of water, plants, and feeders in your yard. Also learn about important ways to record your observations.
Pub. Date
2017.
Language
English
Description
Look into six categories of bird behavior, as they provide vital information for identification. See how individual species are distinguished by typical or unique behavioral traits. Study the distinctive feeding habits of many species, and how we can recognize species from flight and flocking behavior. End by exploring the extraordinary mating and nesting customs of North American birds.
Pub. Date
2017.
Language
English
Description
Plumage variation in a single bird reveals much useful information. First, take account of plumage differences based on sex, and seasonal plumage changes. Then investigate the remarkable range of age-related plumage variation in birds. Learn how birds molt (shed and replace plumage), and how hybrid species, as well as genetic and environmental factors, pose challenges for identification.
Pub. Date
2017.
Language
English
Description
Study the physics and biology of avian sounds, which underlie the rich range of birdsong heard in the field. Discover how birds learn to vocalize, and how bird songs and calls are used for a remarkable spectrum of communication. Look at mimicry in birds, ways to use recordings to attract birds, and how digital technology can teach us more about bird vocalization.
95) The National Geographic Guide to Birding in North America: Episode 11,Essentials of Bird Migration
Pub. Date
2017.
Language
English
Description
Migration seasons provide excellent opportunities to sight unfamiliar bird species. Here, uncover the evolutionary origins of migration, and why birds migrate. Study the triggers and geographical patterns of migration, and the four principal "flyways" (migration zones) of North America. Learn how to maximize your sightings of migrating birds, and how technology can aid this.
Pub. Date
2017.
Language
English
Description
Some additional birding skills are needed for night viewing of birds. Learn about equipment for night birding, ways of locating nocturnal birds, and approaches to viewing migrating birds at night. Then investigate the fascinating range of night birds, encompassing the great diversity of owls, as well as species such as night-herons, nighthawks, and nightjars.
Pub. Date
2017.
Language
English
Description
Open sea birding adds another exciting dimension to birdwatching. Begin with an introduction to sea trips for birding, covering types of excursions and vessels, equipment, and important logistical and safety information. Preview the remarkable birds you'll see, from the mysterious albatross to petrels, tropicbirds, pelicans, gulls, puffins, and the best places to embark from to see them.
Pub. Date
2017.
Language
English
Description
In the first of six lectures on the bird families of North America, study four groups of birds that most people will find close to home. Begin with waterfowl, birds that swim in fresh water or near the ocean shore. Continue with wading birds, with their distinct physical profile; shorebirds, a vast group which includes sandpipers; and upland game birds.
Pub. Date
2017.
Language
English
Description
Now travel into the world of these iconic and alluring birds of prey, and their distinguishing features, ranges, and behaviors. Learn about New World vultures, including the magnificent California condor. Also encounter the osprey, kites, eagles, hawks, falcons, kestrels, and the crested caracara. Consider the challenges of raptor-watching, and their unusual history with humans.
100) The National Geographic Guide to Birding in North America: Episode 16,From Doves to Kingfishers
Pub. Date
2017.
Language
English
Description
Here, study several diverse groups of birds, ranging from the familiar to the exotic. Explore the surprising variety of pigeons and doves, and trace the sad demise of the passenger pigeon. Note the presence of "introduced" parrots in the U.S., and discover the range of cuckoos, anis, woodpeckers, trogons, swifts, hummingbirds, and kingfishers that flourish across North America.
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